Big Idea Negative numbers help us to model many real world situations.
Essential Question: How can I add integers?
Notes from class:
An absolute value is the number’s distance from the zero
If the absolute value of a number is bigger than the answer will always get that number’s symbol.
Problem 2.2: Inventing A New Model
A. Use a chip board and black and red chips to find each sum. Draw each series of chip boards to illustrate your work.
-8+-7=-1
-8+7=-15
8+-7=1
8+7=15
B. Find two combinations of black and red chips that will simplify to represent the given integer. Draw a series of chip boards to prove that each combination works.
-3
+5
C.Write each combination you found in part B as an addition sentence.
-2+-1=-3
3+2=5
Problem 2.2 follow-up:
1. What integer added to -8 gives a sum of -4?
-8+4=-4
2. Give two integers with a sum that is less than either of the two integers.
-2+-4=-6
3. Give two integers with a sum that is greater than wither of the two integers.
5+7=12
4. Use Conrado’s method to compute the following sums in your head.
a. 9+-7=2
b. -80+50=30
c. 35+-27=8
d. -8+-5=-13
17.04.10
A.B
Big Idea
Negative numbers help us to model many real world situations.
Essential Question: How can I add integers?
Notes from class:
Problem 2.2: Inventing A New Model
A. Use a chip board and black and red chips to find each sum. Draw each series of chip boards to illustrate your work.
B. Find two combinations of black and red chips that will simplify to represent the given integer. Draw a series of chip boards to prove that each combination works.
C. Write each combination you found in part B as an addition sentence.
Problem 2.2 follow-up:
1. What integer added to -8 gives a sum of -4?
-8+4=-4
2. Give two integers with a sum that is less than either of the two integers.
-2+-4=-6
3. Give two integers with a sum that is greater than wither of the two integers.
5+7=12
4. Use Conrado’s method to compute the following sums in your head.
a. 9+-7=2
b. -80+50=30
c. 35+-27=8
d. -8+-5=-13